Metal Crack Stitching

See more in our Before/After Photos Section

Cracked or broken industrial castings mechanically stitched with no heat applied, eliminating the heat dangers such as warpage, misalignment, fire hazard, brittleness, etc., associated with welding and brazing ......

Other terms generally used to describe metal stitching are metal locking, metal surgery, cold welding, stitch welding, crack patching, cast iron repairs, cracked machine repairs, cast iron crack repair without welding, cold mechanical stitching....

Restores strength and seals in high pressure
Sectional removal or replacement
On-site repairs with little or no dismantling of equipment
Saves costly replacements and down time
Over 25 years of experience
Price quoted over phone on most occasions

We serve virtually every industry:

Manufacturing
Pulp and Paper
Marine

Steel
Oil Refining
Utilities, etc., etc.,

Equipment repaired using metal stitching method:

Engine & Generator frames
Compressors
Cylinders
Liners
Heads
Fly-wheels
Utilities & Sewage Components
Punch/Forging Presses

Hydro Turbine Runners
Impeller
Condenser Boxes
Pumps
Turbines
Crushers
Mill Stands
Trunions

Kilns
Dryers
Clarifiers
Shears
Drop Hammers
Gears & Housings
Rams
Bearings & much more!

Process in Brief...

Drill series of holes perpendicular to the crack. Join the holes together with chisel so as to form an accurate slot. Insert preformed alloy keys individually into the slots. Due to the serrated design of keys, the casting sections on both sides of the crack are locked together. After the keys are installed, threaded dowels of same alloy are placed along the crack in between the keys in tangent to each other to ensure shear strength and pressure-tight seal. Super keys are reinforcement units, used for higher strength, at areas of maximum stress or wear. These keys are made to size and installed at high stress areas, where parent metal is being removed. The purpose is to dissipate local stress over wider areas.

Each repair is different. It requires individual attention. Quality depends on proper design of repair and workmanship. The proof is in the experience and we have it!!!!!